Preparation method and application of composite photocatalytic nano motor

Abstract

The invention discloses a preparation method of a composite photocatalytic nano motor. The method comprises the following steps of: uniformly mixing multi-walled carbon nanotubes with an acid, and carrying out ultrasonic treatment to obtain acidified multi-walled carbon nanotubes; mixing the acidified multi-walled carbon nanotubes with ethanol to obtain a suspension; sequentially adding nano-aluminum, nano-silver, nano-silica sol and polytetrafluoroethylene into the suspension; carrying out ultrasonic treatment and oscillation to obtain CNTs-Ag-Al-PTFE; uniformly mixing copper oxide, aluminumoxide and hydrochloric acid to prepare a mixed solution; adding the CNTs-Ag-Al-PTFE into the mixed solution, and performing stirring reaction at room temperature; performing centrifugation and washing, and dispersing solids into distilled water, irradiating an obtained solution with a high-pressure mercury lamp; adding the obtained solution into a mixture of hydrogen peroxide-nano silica sol, performing stirring, separating, washing, drying and grinding at room temperature so as to obtain the composite photocatalytic nano motor. The preparation method has the advantages of simple preparation process and easy operation; and the prepared material can effectively remove harmful microorganisms in a water body in a wastewater treatment process.

Description

technical field [0001] The invention belongs to the field of nanomotor material environmental water body treatment, and specifically relates to a preparation method of a composite photocatalytic nanomotor and its application in removing water body microorganisms. Background technique [0002] Various pathogenic viruses and bacteria in water not only pollute the environment, but also threaten human health. Pathogenic viruses such as hepatitis virus, adenovirus, coliphage and enterovirus can cause harm to human health. At the same time, pathogenic bacteria in water such as Escherichia coli, Salmonella and other infections can easily lead to diarrhea, enteritis, meningitis and other diseases that seriously threaten human health, so the removal of pathogenic factors in water is imminent. [0003] Due to the wide variety of pathogenic factors in water bodies, viruses have no cell structure and obligately parasitize living sensitive hosts. Most viruses with a diameter of 20-200nm...

AI Technical Summary

Problems solved by technology

The flocculation and sedimentation method has a good encapsulation of bacteria, which is mainly removed by flocculating with bacteria into larger particles, but the demand for flocculants is relatively large; the chemical oxidation method is mainly photocatalytic oxidation and sterilization, which destroys the structure of bacteria and makes them inactive. Bromide needs to be introduced; membrane biological treatment mainly uses hollow fiber membranes for filtration and dialysis, but large doses of disinfectants are required to remove viruses during membrane biological treatment, which is prone to produce harmful disinfection by-products; among them, reverse osmosis technology can remove Most types and quantities of viruses, but reverse osmosis technology requires huge operating pressure; water after ultraviolet treatment is easy to cause secondary pollution during transportation

[0004] As a micro-scale controllable purification subject, nanomotors can be used in various fields, especially in the delivery of medicines and media. However, due to the limited internal and external control methods of nanomotors, they are rarely used in the field of water treatment. Especially in the study of virus adsorption in water, there is still a lack of technology to purify water using nanomotor devices combined with charged materials-carbon nanometers (CNTs) composite materials.